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<FONT color="green">001</FONT>    package org.hackystat.telemetry.analyzer.function.impl;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.util.List;<a name="line.3"></a>
<FONT color="green">004</FONT>    <a name="line.4"></a>
<FONT color="green">005</FONT>    import org.hackystat.telemetry.analyzer.function.TelemetryFunctionException;<a name="line.5"></a>
<FONT color="green">006</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryDataPoint;<a name="line.6"></a>
<FONT color="green">007</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryStream;<a name="line.7"></a>
<FONT color="green">008</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryStreamCollection;<a name="line.8"></a>
<FONT color="green">009</FONT>    import org.hackystat.utilities.time.period.TimePeriod;<a name="line.9"></a>
<FONT color="green">010</FONT>    <a name="line.10"></a>
<FONT color="green">011</FONT>    /**<a name="line.11"></a>
<FONT color="green">012</FONT>     * Helper class to perform binary operations on &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; objects.<a name="line.12"></a>
<FONT color="green">013</FONT>     * <a name="line.13"></a>
<FONT color="green">014</FONT>     * @author (Cedric) Qin ZHANG, Philip Johnson<a name="line.14"></a>
<FONT color="green">015</FONT>     */<a name="line.15"></a>
<FONT color="green">016</FONT>    class BinaryOperationUtility {<a name="line.16"></a>
<FONT color="green">017</FONT>      <a name="line.17"></a>
<FONT color="green">018</FONT>      /**<a name="line.18"></a>
<FONT color="green">019</FONT>       * Binary operator interface.<a name="line.19"></a>
<FONT color="green">020</FONT>       * <a name="line.20"></a>
<FONT color="green">021</FONT>       * @author (Cedric) Qin ZHANG<a name="line.21"></a>
<FONT color="green">022</FONT>       */<a name="line.22"></a>
<FONT color="green">023</FONT>      interface BinaryOperator {<a name="line.23"></a>
<FONT color="green">024</FONT>        /**<a name="line.24"></a>
<FONT color="green">025</FONT>         * Performs binary operation.<a name="line.25"></a>
<FONT color="green">026</FONT>         * <a name="line.26"></a>
<FONT color="green">027</FONT>         * @param a Number 1.<a name="line.27"></a>
<FONT color="green">028</FONT>         * @param b Number 2.<a name="line.28"></a>
<FONT color="green">029</FONT>         * @return The result.<a name="line.29"></a>
<FONT color="green">030</FONT>         */<a name="line.30"></a>
<FONT color="green">031</FONT>        Number computes(Number a, Number b);<a name="line.31"></a>
<FONT color="green">032</FONT>      }<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>      /**<a name="line.34"></a>
<FONT color="green">035</FONT>       * Applies binary operation to two &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; objects, <a name="line.35"></a>
<FONT color="green">036</FONT>       * and generates a new &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; object.<a name="line.36"></a>
<FONT color="green">037</FONT>       * <a name="line.37"></a>
<FONT color="green">038</FONT>       * @param operator The binary operator.<a name="line.38"></a>
<FONT color="green">039</FONT>       * @param streamCollection1 The first &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; object.<a name="line.39"></a>
<FONT color="green">040</FONT>       * @param streamCollection2 The second &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; object.<a name="line.40"></a>
<FONT color="green">041</FONT>       * @return A new &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; object after applying the operator.<a name="line.41"></a>
<FONT color="green">042</FONT>       * @throws TelemetryFunctionException If there is anything wrong.<a name="line.42"></a>
<FONT color="green">043</FONT>       */<a name="line.43"></a>
<FONT color="green">044</FONT>      static TelemetryStreamCollection computes(BinaryOperator operator,<a name="line.44"></a>
<FONT color="green">045</FONT>          TelemetryStreamCollection streamCollection1, TelemetryStreamCollection streamCollection2) <a name="line.45"></a>
<FONT color="green">046</FONT>          throws TelemetryFunctionException {<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        // check whether the streams in the two collections can be matched.<a name="line.48"></a>
<FONT color="green">049</FONT>        if (!streamCollection1.getProject().equals(streamCollection2.getProject())) {<a name="line.49"></a>
<FONT color="green">050</FONT>          throw new TelemetryFunctionException("Two stream collections are for different projects.");<a name="line.50"></a>
<FONT color="green">051</FONT>        }<a name="line.51"></a>
<FONT color="green">052</FONT>        if (!streamCollection1.getInterval().equals(streamCollection2.getInterval())) {<a name="line.52"></a>
<FONT color="green">053</FONT>          throw new TelemetryFunctionException("Two stream collections are for different intervals.");<a name="line.53"></a>
<FONT color="green">054</FONT>        }<a name="line.54"></a>
<FONT color="green">055</FONT>        if (streamCollection1.getTelemetryStreams().size() //NOPMD<a name="line.55"></a>
<FONT color="green">056</FONT>            != streamCollection2.getTelemetryStreams().size()) {<a name="line.56"></a>
<FONT color="green">057</FONT>          throw new TelemetryFunctionException(<a name="line.57"></a>
<FONT color="green">058</FONT>              "Two stream collections have different number of streams.");<a name="line.58"></a>
<FONT color="green">059</FONT>        }<a name="line.59"></a>
<FONT color="green">060</FONT>        else {<a name="line.60"></a>
<FONT color="green">061</FONT>          for (TelemetryStream stream1 : streamCollection1) {<a name="line.61"></a>
<FONT color="green">062</FONT>            if (streamCollection2.get(stream1.getTag()) == null) {<a name="line.62"></a>
<FONT color="green">063</FONT>              throw new TelemetryFunctionException("Two stream collections do not match.");<a name="line.63"></a>
<FONT color="green">064</FONT>            }<a name="line.64"></a>
<FONT color="green">065</FONT>          }<a name="line.65"></a>
<FONT color="green">066</FONT>        }<a name="line.66"></a>
<FONT color="green">067</FONT>    <a name="line.67"></a>
<FONT color="green">068</FONT>        //do computation<a name="line.68"></a>
<FONT color="green">069</FONT>        try {<a name="line.69"></a>
<FONT color="green">070</FONT>          TelemetryStreamCollection resultStreams = new TelemetryStreamCollection(null,<a name="line.70"></a>
<FONT color="green">071</FONT>              streamCollection1.getProject(), streamCollection2.getInterval());<a name="line.71"></a>
<FONT color="green">072</FONT>          for (TelemetryStream stream1 : streamCollection1) {<a name="line.72"></a>
<FONT color="green">073</FONT>            TelemetryStream stream2 = streamCollection2.get(stream1.getTag());<a name="line.73"></a>
<FONT color="green">074</FONT>            resultStreams.add(computes(operator, stream1, stream2));<a name="line.74"></a>
<FONT color="green">075</FONT>          }<a name="line.75"></a>
<FONT color="green">076</FONT>          return resultStreams;<a name="line.76"></a>
<FONT color="green">077</FONT>        }<a name="line.77"></a>
<FONT color="green">078</FONT>        catch (Exception ex) {<a name="line.78"></a>
<FONT color="green">079</FONT>          throw new TelemetryFunctionException(ex.getMessage(), ex);<a name="line.79"></a>
<FONT color="green">080</FONT>        }<a name="line.80"></a>
<FONT color="green">081</FONT>      }<a name="line.81"></a>
<FONT color="green">082</FONT>      <a name="line.82"></a>
<FONT color="green">083</FONT>      /**<a name="line.83"></a>
<FONT color="green">084</FONT>       * Applies binary operation to two telemetry streams and generates a new stream.<a name="line.84"></a>
<FONT color="green">085</FONT>       * The two source streams must:<a name="line.85"></a>
<FONT color="green">086</FONT>       * &lt;ul&gt;<a name="line.86"></a>
<FONT color="green">087</FONT>       * &lt;li&gt;Have the same tag.&lt;/li&gt;<a name="line.87"></a>
<FONT color="green">088</FONT>       * &lt;li&gt;All time periods in the data points must match.&lt;/li&gt;<a name="line.88"></a>
<FONT color="green">089</FONT>       * &lt;/ul&gt;<a name="line.89"></a>
<FONT color="green">090</FONT>       * If one of the values in a data point is null, then a null will be put in the<a name="line.90"></a>
<FONT color="green">091</FONT>       * generated data point.<a name="line.91"></a>
<FONT color="green">092</FONT>       * <a name="line.92"></a>
<FONT color="green">093</FONT>       * @param operator The binary operator.<a name="line.93"></a>
<FONT color="green">094</FONT>       * @param stream1 Source telemetry stream 1. Order may be important in certain<a name="line.94"></a>
<FONT color="green">095</FONT>       *        operations.<a name="line.95"></a>
<FONT color="green">096</FONT>       * @param stream2 Source telemetry stream 2. Order may be important in certain<a name="line.96"></a>
<FONT color="green">097</FONT>       *        operations.<a name="line.97"></a>
<FONT color="green">098</FONT>       * @return The new generated telemetry stream after applying the operator.<a name="line.98"></a>
<FONT color="green">099</FONT>       * @throws TelemetryFunctionException If there is any error.<a name="line.99"></a>
<FONT color="green">100</FONT>       */<a name="line.100"></a>
<FONT color="green">101</FONT>      private static TelemetryStream computes(BinaryOperator operator,<a name="line.101"></a>
<FONT color="green">102</FONT>          TelemetryStream stream1, TelemetryStream stream2) throws TelemetryFunctionException {<a name="line.102"></a>
<FONT color="green">103</FONT>        // check tag match<a name="line.103"></a>
<FONT color="green">104</FONT>        Object tag1 = stream1.getTag();<a name="line.104"></a>
<FONT color="green">105</FONT>        Object tag2 = stream2.getTag();<a name="line.105"></a>
<FONT color="green">106</FONT>        if (tag1 == null) {<a name="line.106"></a>
<FONT color="green">107</FONT>          if (tag2 != null) {<a name="line.107"></a>
<FONT color="green">108</FONT>            throw new TelemetryFunctionException(<a name="line.108"></a>
<FONT color="green">109</FONT>                "The tags of the two telemetry streams does not match.");<a name="line.109"></a>
<FONT color="green">110</FONT>          }<a name="line.110"></a>
<FONT color="green">111</FONT>        }<a name="line.111"></a>
<FONT color="green">112</FONT>        else {<a name="line.112"></a>
<FONT color="green">113</FONT>          if (!tag1.equals(tag2)) {<a name="line.113"></a>
<FONT color="green">114</FONT>            throw new TelemetryFunctionException(<a name="line.114"></a>
<FONT color="green">115</FONT>                "The tags of the two telemetry streams does not match.");<a name="line.115"></a>
<FONT color="green">116</FONT>          }<a name="line.116"></a>
<FONT color="green">117</FONT>        }<a name="line.117"></a>
<FONT color="green">118</FONT>        // check number of data points in the two streams<a name="line.118"></a>
<FONT color="green">119</FONT>        List&lt;TelemetryDataPoint&gt; dataPointSeries1 = stream1.getDataPoints();<a name="line.119"></a>
<FONT color="green">120</FONT>        List&lt;TelemetryDataPoint&gt; dataPointSeries2 = stream2.getDataPoints();<a name="line.120"></a>
<FONT color="green">121</FONT>        if (dataPointSeries1.size() != dataPointSeries2.size()) {<a name="line.121"></a>
<FONT color="green">122</FONT>          throw new TelemetryFunctionException("Two telemetry streams are of different size.");<a name="line.122"></a>
<FONT color="green">123</FONT>        }<a name="line.123"></a>
<FONT color="green">124</FONT>    <a name="line.124"></a>
<FONT color="green">125</FONT>        //do computation<a name="line.125"></a>
<FONT color="green">126</FONT>        TelemetryStream resultStream = new TelemetryStream(tag1);<a name="line.126"></a>
<FONT color="green">127</FONT>        try {<a name="line.127"></a>
<FONT color="green">128</FONT>          int size = dataPointSeries1.size();<a name="line.128"></a>
<FONT color="green">129</FONT>          for (int i = 0; i &lt; size; i++) {<a name="line.129"></a>
<FONT color="green">130</FONT>            TelemetryDataPoint dataPoint1 = dataPointSeries1.get(i);<a name="line.130"></a>
<FONT color="green">131</FONT>            TelemetryDataPoint dataPoint2 = dataPointSeries2.get(i);<a name="line.131"></a>
<FONT color="green">132</FONT>            TimePeriod timePeriod = dataPoint1.getPeriod();<a name="line.132"></a>
<FONT color="green">133</FONT>            if (!timePeriod.equals(dataPoint2.getPeriod())) {<a name="line.133"></a>
<FONT color="green">134</FONT>              throw new TelemetryFunctionException(<a name="line.134"></a>
<FONT color="green">135</FONT>                  "Different time periods detected in the two streams.");<a name="line.135"></a>
<FONT color="green">136</FONT>            }<a name="line.136"></a>
<FONT color="green">137</FONT>            Number value1 = dataPoint1.getValue();<a name="line.137"></a>
<FONT color="green">138</FONT>            Number value2 = dataPoint2.getValue();<a name="line.138"></a>
<FONT color="green">139</FONT>            Number resultValue = null;<a name="line.139"></a>
<FONT color="green">140</FONT>            if (value1 != null &amp;&amp; value2 != null) {<a name="line.140"></a>
<FONT color="green">141</FONT>              resultValue = operator.computes(value1, value2);<a name="line.141"></a>
<FONT color="green">142</FONT>            }<a name="line.142"></a>
<FONT color="green">143</FONT>            resultStream.addDataPoint(new TelemetryDataPoint(timePeriod, resultValue));<a name="line.143"></a>
<FONT color="green">144</FONT>          }<a name="line.144"></a>
<FONT color="green">145</FONT>        }<a name="line.145"></a>
<FONT color="green">146</FONT>        catch (Exception ex) {<a name="line.146"></a>
<FONT color="green">147</FONT>          throw new TelemetryFunctionException(ex.getMessage(), ex);<a name="line.147"></a>
<FONT color="green">148</FONT>        }<a name="line.148"></a>
<FONT color="green">149</FONT>        return resultStream;<a name="line.149"></a>
<FONT color="green">150</FONT>      }<a name="line.150"></a>
<FONT color="green">151</FONT>    }<a name="line.151"></a>




























































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